11316821 has 4 divisors (see below), whose sum is σ = 11340000. Its totient is φ = 11293644.

The previous prime is 11316817. The next prime is 11316839. The reversal of 11316821 is 12861311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11316821 - 2² = 11316817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11316871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10841 + ... + 11838.

It is an arithmetic number, because the mean of its divisors is an integer number (2835000).

Almost surely, 2^11316821 is an apocalyptic number.

It is an amenable number.

11316821 is a deficient number, since it is larger than the sum of its proper divisors (23179).

11316821 is an equidigital number, since it uses as much as digits as its factorization.

11316821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23178.

The product of its digits is 288, while the sum is 23.

The square root of 11316821 is about 3364.0483052418. The cubic root of 11316821 is about 224.5129943884.

The spelling of 11316821 in words is "eleven million, three hundred sixteen thousand, eight hundred twenty-one".